WOOD DENSITY VARIATION AND TREE RING DEMARCATION IN Gmelina arborea TREES USING X-RAY DENSITOMETRY


Autoria(s): MOYA, Roger; TOMAZELLO FILHO, Mario
Contribuinte(s)

UNIVERSIDADE DE SÃO PAULO

Data(s)

17/04/2012

17/04/2012

2009

Resumo

Due to its relationship with other properties, wood density is the main wood quality parameter. Modern, accurate methods - such as X-ray densitometry - are applied to determine the spatial distribution of density in wood sections and to evaluate wood quality. The objectives of this study were to determinate the influence of growing conditions on wood density variation and tree ring demarcation of gmelina trees from fast growing plantations in Costa Rica. The wood density was determined by X-ray densitometry method. Wood samples were cut from gmelina trees and were exposed to low X-rays. The radiographic films were developed and scanned using a 256 gray scale with 1000 dpi resolution and the wood density was determined by CRAD and CERD software. The results showed tree-ring boundaries were distinctly delimited in trees growing in site with rainfall lower than 25 10 mm/year. It was demonstrated that tree age, climatic conditions and management of plantation affects wood density and its variability. The specific effect of variables on wood density was quantified by for multiple regression method. It was determined that tree year explained 25.8% of the total variation of density and 19.9% were caused by climatic condition where the tree growing. Wood density was less affected by the intensity of forest management with 5.9% of total variation.

Vice-Rector of Research of ITCR

Camara Costarricense Forestal and Organization American States

Identificador

CERNE, v.15, n.1, p.92-100, 2009

0104-7760

http://producao.usp.br/handle/BDPI/14746

http://www.dcf.ufla.br/cerne/artigos/08-01-20102707v15_n1_artigo%2012.pdf

Idioma(s)

eng

Publicador

UNIV FEDERAL LAVRAS-UFLA

Relação

Cerne

Direitos

openAccess

Copyright UNIV FEDERAL LAVRAS-UFLA

Palavras-Chave #Gmelina arborea #tree-rings #X-ray densitometry #wood anatomy #FEATURES #Forestry
Tipo

article

original article

publishedVersion